Btrfs filesystem won't expand to partition size

[BluishHumility]

I think I see the source of the confusion.

@Binozo

/dev/nvme0n1 is the new SSD

nvme0n1 has been resized correctly, it’s showing 1 TB.

However, these commands are not targeting nvme0n1:

@Binozo

btrfs filesystem resize max /

and

btrfs filesystem balance start /

but whatever I do, btrfs still tells me the same device size:

# btrfs device usage /

It looks like nvme1n1p2 is mounted at /–not nvme0n1. See here:

@Binozo

ID-1: / raw-size: 476.64 GiB size: 476.64 GiB (100.00%)
used: 411.74 GiB (86.4%) fs: btrfs dev: /dev/nvme1n1p2 maj-min: 259:2
ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
used: 580 KiB (0.2%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:4

The EFI partition is on nvme0n1, but the root partition is on nvme1n1.

To resize the filesystem on nvme0n1, you will have to use its mount point as the argument of the command instead of /. I can’t see the full mount point in the picture (it’s cut off), but it starts with /run/media....

sudo btrfs filesystem resize max /run/media/blah_blah_blah